Extension-ladder.



H. & S. M. PISARZ.

EXTENSION LADDER.

APPLICATION FILED AUG. 5, 1913.

Patented Mar. 10, 1914 2 SHEETS-SHEET l.

6M ATTORNEVS WITNESSES 'l; INVENTOR5 QMM% H PM? Q enrr SATES PATENTOFFTGE.

HENRY PISARZ AND STASH 1V1. PISARZ, OF LOS ANGELES, CALIFORNIA.

EXTENSION-LADDER.

resasea.

To all whom it may concern Be it known that we, HENRY PISARZ and S'rasiiM P'ISARZ, 1, a subject of the Emperor of Austriadlungary, and, 2, acitizen of the United States of America, residing at Los Angeles, in thecounty of Los Angeles and State of California, have invented certain net and useful Improvements in EX- tension-Ladders, of which the followingis a specification, reference being had therein to the accompanyingdrawing.

This invention relates to extension ladders, and more particularly tothat type of ladder used by lire departments for scaling walls andreaching points about a building that could not under ordinaryCllGlllIl' stances be reached except by an extremely long ladder.

The primary object of our invention is to provide a compact extensionladder consisting of a base section, lower and upper intermediatesections and a top section these four sections being arranged tocollapse into a compact form, whereby the ladder :an be easily carriedby a fire apparatus or vehicle.

A further object of this invention is to provide a strong and durablesectional extension ladder that has the sections thereof arrangedwhereby they can be easily and quickly extended to provide a safestructure that can be easily ascended or descended.

lVith the above and other objects in view the invention resides in thenovel construction, combination and arrangement of parts to behereinafter specifically described and then claimed.-

Reference will now be had to the drawiugs, wherein Figure 1 is a sideelevation of the extension ladder collapsed, Fig. 2 is a rear elevationof the same, Fig. 3 is a vertical sec tional view of the extensionladder col lapsed, Fig. t is a cross sectional view of the same, Fig. 5is a side elevation of a portion of the ladder extended, Fig. 6 is anenlarged detail sectional view of a portion of the ladder, Fig. 7 anenlarged longitudinal sectional view of the ladder extended and partlybroken away, showing one side thereof, and Fig. 8 is a similar viewshowing the opposite side of the ladder.

A ladder in accordance with this invention embodies a base section, alower intermediate section, an upper intermediate section, and a topsection arranged to slide to- Specification of Letters Patent.

Application filed August 5, 1913.

Patented Mar. 10, 1914.

Serial No. 783,201.

gether, whereby the ladder when collapsed will have a longitudinaldimension corresponding to the length of one of said sections,especially the base section. All of the sections with the exception ofthe top section have hand rails whereby the ladder can be safelyascended or descended.

The base section comprises stiles 1 and 2 having the confronting sidesthereof provided with angle bars 3 that are cut away, as at 1 toaccommodate transverse rounds 5. The stiles 1 and 2 are provided withequally spaced arms (3 that are arranged at right angles to the frontedges of said stiles, and said arms are connected together bylongitudinal hand rails 7 that cooperate with the angle bars in formingguides for the lower intermediate section.

The rear edges of the stiles 1 and 2 are provided with bearings 8 forthe spindle 9 of a revoluble roller or Windlass 10. The end of thespindle 9, at the stile 2 is provided with a detachable crank handle 11and a ratchet wheel 12. The ratchet wheel 12 is engaged by a pivotedpawl. 13 carried by the stile 2 and said pawl is held in engagementtherewith by a spring 1.4; arranged in a strap 15 carried by the stile2. The pawl can be locked in or out of engagement with the ratchet wheel12 by a pivoted dog 16 carried by the stile 2.

The stiles 1 and 2 have the confronting sides thereof, at the upper endsprovided with bearing blocks 17 and connected to said bearing blocks arepulleys or sheaves 18. The bearing block 17 of the stile 1 has a stop 19and the bearing block of the stile 2 has a catch 20, the object of whichwill presently appear.

The lower intermediate section comprises stiles 21 and 22 provided withangle bars 23, rounds 2+1, arms 25 and hand rails 26. The hand rails 26and the angle bars 23 constitute guides for the upper intermediatesection, and the stiles 21 and 22 of the lower intermediate sectionslide in the guides formed by the angle bars and the hand rails 7 of thebase section. The confronting sides of the stiles 21 and 22, at thelower ends thereof, are provided with sheaves or pulleys 27 and thestile 21 has a stop pin 28 adapted to engage the stop 19 and limit theupward movement of the lower intermediate section.

The confronting sides of the stiles 21 and 22 at the upper ends thereof,are provided with bearing blocks 29 and 30, the bearing block 29 of thestile 21 being cut away, as shown in Fig. 3 to provide clearance for thestop 19. The bearing blocks support sheaves or pulleys 31 and thebearing block 30 is provided with a strap 32 and pivotally mounted uponthe upper end of the stile 22 is a pivoted bell crank 33 that extendsthrough the strap 32 and is engaged by a compression spring 34. ()ne endof the bell crank is in the path of the catch 20 and the opposite endthereof extends into the upper intermediate section.

The upper intermediate section comprises stiles 35 and 35 having anglebars 36, rounds 37, arms 38 and hand rails 39, said hand rails and saidangle bars providing guides for the top section of the ladder. Thestiles 35 and 35 slide in the guides formed by the hand rails 26 and theangle bars 23 of the stiles 21 and 22 and the lower confronting ends ofthe stiles and 35* have sheaves or pulleys 40. The lower end of thestile 35 has a combined cam and stop 41 that is engaged by the bellcrank 33 to limit the upward movement of the upper intermediate sectionrelatively to the lower intermediate section.

The upper confronting ends of the stiles 35 and 35 are provided withbearing blocks 42 and 43, said blocks supporting sheaves or pulleys 44.The block 43 is cut away and provided with a stop 45 that engages thebell crank 33 when the ladder is collapsed. The block also has a stop 46that engages a pin 47, carried by the stile 48 of the top section, saidtop section having another stile 49, with said stiles connected togetherby rounds 50. The lower end of the stile 48 has another pin 51 that isengaged by the stop 46 whereby the top section will be limited in itsupward movement. The top section slides in the guides formed by the handrails 39 and the angle bars 36 of the stiles 35 and 35 of the upperintermediate section.

The lower ends of the stiles 48 and 49 oi the top section are providedwith eyes 52 and extending through said eyes is a cable 53. The cable 53passes over the sheaves 44, under the sheaves 40, over the sheaves 31,under the sheaves 27, and over the sheaves 18, said cable having theends thereof attached to and wound upon the roller or Windlass 10. Whenthe ladder is collapsed one end of the bell crank 33 extends under thestop 45 and the other end under the catch 20. As the Windlass isrevolved, the top section is gradually elevated until the Gopies of thispatent may be obtained. for five cents each, by addressing theCommissioner eyes 52 are in proximity to the sheaves 44 at which timethe stop 51 engages the stop 46 and a further movement of the roller orwindlass 10 causes the upper intermediate section to move, carrying withit the top section. The lower intermediate section is prevented frommoving by the end of the crank 33 extending under the catch 20. As theupper intermediate'section'is elevated the combined catch and stop 41engages the end of the crank 33 and the opposite end of the crank isforced out from under the catch 20, thereby freeing the lowerintermediate section to permit of the same being elevated, and it can beelevated until the pin 28 en gages the stop 19 of the base section.

Assuming now that the ladder is to be collapsed, the pawl 13 is movedout of engagement with the ratchet wheel 12 and by hold.- ing onto thecrank 11 it can be gradually collapsed without any danger of thesections thereof being injured. The lower intermediate section firstrides into parallelism with the base section and as the lowerintermediate section descends, the catch 20 knocks the end of the crank33 out of engagement with the combined stop and cam 41 and the upperintermediate section can descend. Immediately upon the stop 45 of theupper intermediate section engaging the end of the crank 33, the topsection descends into the guides of the upper intermediate section.

It is thought that the operation and utility of our extension ladderwill be apparent without further description, and while in the drawingsthere is illustrated a preferred embodiment of the invention it is to beunderstood that the structural elements are susceptible to suchvariations and modifications as fall within the scope of the appendedclaim.

hat we claim is An extension ladder comprising a plurality of sections,each having a guide bar thereon and laterally projecting arms carryinghand rails parallel to the stiles of the section, and guide bars soarranged that the hand rails and guide bars of the lower sectionconstitute embracing guides for the next upper section. V

In testimony whereof we aflix our signatures in the presence of twowitnesses.

HENRY PISARZ. STASH M. PISARZ.

Witnesses Josnrrr GNozDonKI, JOSEPH SToMBRYs.

of Patents,

Washington, D. C.

